Can ACID be ensured with Redis?

Redis does not provide full ACID properties like traditional relational databases.

• Atomicity: Redis supports atomicity of individual commands and transactions (MULTI/EXEC), but transactions are not isolated and do not support rollback on error within a transaction.
• Consistency: Redis ensures data consistency within a single instance, but synchronization delay is possible during replication.
• Isolation: Redis transactions are not isolated; commands within a transaction are executed sequentially, but other clients may see intermediate states.
• Durability: By default, Redis stores data in memory but supports saving to disk (RDB, AOF). However, data loss can occur during crashes.

Thus, Redis is suitable for scenarios requiring high performance and acceptable data loss, but not for systems requiring strict ACID guarantees.